10.04 won't boot without monitor / keyboard (headless)

I have several computers, both Ubuntu and windows xp. I have just put 10.04 onto a computer that I propose to boot without a monitor and to access from elsewhere using vinagre / vnc.
Having installed 10.04 (and very nice it is too!), the computer will not boot without a monitor attached. After powering up and attaching a monitor, I see a black screen that requires a hard power-down to escape from. Boots fine with a monitor attached, thereafter I can detach the monitor and vinagre fine.
I have reviewed this machine's bios (an HP desktop) and see no mention of suspending boot on no monitor.
I have replaced the /etc/X11/xorg.conf file with the failsafe and have edited and updated the grub conf file to "quiet" as recommended elsewhere. No joy.
I gather that this may be related to a monitor test that's performed when x starts up.
Thanks in advance for all help. I can see that there are a quite a few threads on this subject over the last year.

Re: 10.04 won't boot without monitor / keyboard (headless)

Bump.

I am also having the same problem. Did an upgrade form a very stable 9.10 to 10.04 last night. It hosed my boot up. Upon reattaching KVM, it immediately rebooted up to the new gui. When i detached and rebooted, it was borked again.

I did a fresh install of 10.04 and was able to get it to work correctly, with no KVM attached, but without the monitor, it won't start GDM. I use GDM for some graphical network monitoring tools.

Re: 10.04 won't boot without monitor / keyboard (headless)

Re: 10.04 won't boot without monitor / keyboard (headless)

I think I may be having the same issue. Upgraded from 9.10 to 10.04 and since then cannot boot. Tried removing the KVM and plugging in the USB mouse/keyboard directly, didn't work, tried pulling that and plugging in an older keyboard, nothing, seems to be in boot up hell. I get endless messages, not sure what is significant. seems to stop sometime after "checking battery state" huh? I go to the recovery, and after choosing some flavor of 9.10 (only options) I get a menu where I should be able to chose several options (repair packages is one) but if I try to select a flash of full screen text shoots past and I'm back at the menu (cant select anything). Help please.